方志刚,贾芳科,左禹,唐聿明,赵旭辉.5083 铝合金环氧涂层盐水浸泡失效研究[J].表面技术,2015,44(7):86-91.
FANG Zhi-gang,JIA Fang-ke,ZUO Yu,TANG Yu-ming,ZHAO Xu-hui.Study on Failure Process of Epoxy Coating on 5083 Aluminum Alloy under Salt Immersing Condition[J].Surface Technology,2015,44(7):86-91 |
| 5083 铝合金环氧涂层盐水浸泡失效研究 |
| Study on Failure Process of Epoxy Coating on 5083 Aluminum Alloy under Salt Immersing Condition |
| 投稿时间：2015-03-03 修订日期：2015-07-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.07.016 |
| 中文关键词: 环氧涂层 5083 铝合金 电化学阻抗谱 涂层失效 |
| 英文关键词:epoxy coating 5083 aluminum alloy EIS coating degradation |
| 基金项目:教育部科学技术研究重点资助项目(108129) |
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| Author | Institution |
| FANG Zhi-gang | Naval Academy of Armament, Beijing 100161, China |
| JIA Fang-ke | 1. Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China;2. China Petro Hohhot Petrochemical Company, Hohhot 010070, China |
| ZUO Yu | Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China |
| TANG Yu-ming | Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China |
| ZHAO Xu-hui | Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China |
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| 中文摘要: |
| 目的 研究铝合金基体上环氧涂层在盐水浸泡环境中的电化学阻抗谱变化规律,揭示涂层失效的原因和机制。 方法 采用电化学阻抗谱技术、红外测试、扫描电镜及能谱分析等方法,研究涂覆在5083 铝合金基体上的环氧涂层在盐水浸泡过程中的裂化过程和失效机制。 结果 在 3. 5% (质量分数)NaCl 溶液的连续浸泡下,涂层电阻明显下降、电容明显增大,相应的涂层孔隙率和吸水体积百分数均逐渐增加;长期浸泡后,涂层孔隙率和吸水体积百分数均趋于稳定。 随着浸泡时间的增加,涂层表面孔洞等缺陷增多,保护作用减弱;涂层内氧元素含量逐渐增加,碳元素含量逐渐减小;涂层内有羟基生成和 C—O键的断裂发生。 结论 环氧涂层中环氧官能基团在电解质溶液中发生水解,水解形成羟基和氨基等亲水基团以及涂层中存在的孔洞等缺陷,进一步促进电解液的渗透,加速涂层的劣化。 金属基体表面腐蚀反应会促进涂层与基体的剥离,腐蚀产物在涂层内的累积,也会导致涂层内孔隙和缺陷增多,促进涂层劣化。 |
| 英文摘要: |
| Objective To study EIS evolution of 5083 aluminum alloy with epoxy coating under salt immersing condition, and to discuss the failure reason and mechanism of the coating. Methods The degradation process and the failure mechanism of an epoxy primer coating on 5083 aluminum alloy in the 3. 5% (mass fraction)NaCl solution were investigated by EIS, SEM, EDS and FTIR. Results Under continuous immersion condition in the 3. 5% (mass fraction)NaCl solution, the coating resistance decreased and the coating capacitance increased along with immersion time. The porosity and water absorptivity of coating also increased with time, but after a long immersion, they showed little change. With increased immersion time, the pores in coating increased, and the coating protection decreased. With increased immersion time, oxygen content in coating increased, while carbon content declined. Due to hydrolysis of epoxy groups in coating, the group —OH was produced and the C—O bond was partly broken. Conclusion The degradation of the coating under salt immersion condition was mainly due to the hydrolysis of epoxy groups in electrolyte solution. The hydrophilic groups such as —OH and NH2 - from the hydrolysis of epoxy groups, as well as the defects of coating such as micro-pores, promoted the electrolyte solution penetration and accelerated the degradation process. Moreover, corrosion of metal substrate can result in disbonding of coating / substrate interface, the accumulation of corrosion products in the coatings also can lead to increase of pores and defects and degradation of the coating. |
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